There is a list that should help you out within the app system. If you go to the help section on the left side of the app page and click on faq a list should come up that includes course subjects. Click on the course subjects link and you will be able to navigate a general list of how to classify certain classes.
Btw... Does anyone know how to classify Capstone classes or independent research?
Also I am having trouble inputting retroactive credits I received by skipping earlier classes in a series, any advice?